Silicon derivatives of ferrocene

ABSTRACT

Silyation of ferrocene in AlCl3-catalyzed reactions with aminosilanes, chlorosilanes or aminochlorosilanes, constituting successful use of halosilanes in reactions analogous to FriedelCrafts alkylation, and providing a novel, facile route to silicon compounds of ferrocene.

United States Patent 1 1 Sollott et al.

[ Sept, 18, 1973 SILICON DERIVATIVES OF FERROCENE [75] Inventors: Gilbert P. Sollott, Plymouth Meeting; William R. Peterson, Levittown, both of Pa.

[73] Assignee: The United States of America as represented by the Secretary of the Army, Washington, D.C.

221 Filed: Sept. 12, 1968 21 App]. No.2 759,492

OTHER PUBLICATIONS Sollott et al., .I. Organometal Chem. 4 (1965) p.

Sollott et al., Abstract of Paper Presented at 3rd international Symposium on Organometallic Chemistry, Munich, Aug. 28 Sept. 1, 1967.

Sollott et al., (Ill) Organic Chem., Vol. 30 (1965), p. 389-393.

Post, Silicones and Other Organic Silicon Compounds, Reinhold Publishing Corp, New York, N.Y., 1949, p. 15-17 Topchiev, Chem. Abstracts, Vol. 62, (1965) Column 8713 Primary ExaminerDaniel E. Wyman Assistant Examiner-A. P. Demers AttorneyHarry M. Saragovitz, Edward J. Kelly, Herbert Berl and S, Dubroff [57] ABSTRACT Silyation of ferrocene in AlCl -catalyzed reactions with aminosilanes, chlorosilanes or aminochlorosilanes, constituting successful use of halosilanes in reactions analogous to Friedel-Crafts alkylation, and providing a novel, facile route to silicon compounds of ferrocene.

1 Claim, No Drawings 1 2 SILICON DERIVATIVES OF FERROCENE Other and further objects of the invention will be- The invention described herein may be manufaccome apparent as the invention is further described tured, used and licensed by or for the Government for hereinafter. governmental purposes without the payment to us of Silicon derivatives of ferrocene are useful for high any royalty thereon. 5 temperature lubricants and hydraulic fluids. They are This invention relates to ferrocene compounds and known for their ability to promote long term lubricity. more particularly concerns new methods for synthesiz- They also serve as satisfactory gelling agents. ing silicon compounds of ferrocene. Briefly, we have discovered that ferrocene may be The structure of ferrocene (FcH), biscaused to react with a chlorosilane, aminosilane, or cyclopentadienyliron, may be described as a sandwichl0 aminochlorosilane and anhydrous AlCl in a suitable type structure having an iron atom between two stagsolvent such as refluxing n-heptane or n-octane. The v gered cyclopentadiene rings: silylated ferrocenes obtained are presented in Table I.

The various products presented in Table l above were synthesized in accordance with the generic procedure outlined below:

A solution of 0.1 mole of the chlorosilane, aminosilane, or amino-chlorosilane in 50 ml of n-heptane or n-octane is added dropwise under dry nitrogen over a period of about 10 minutes to ferrocene and aluminum TABLE I.-SILYLATION OF FERROCENE (FCH) Molar rates, FcH: silane: Recovered Silane A1013 Solvent 5 Products (yield, percent) b FcH, percent (C5Hr)zSi(C1)N(CzH5)z-dipheny1(N,N- 2:111 n-Octane FcSi(0H)(CH5)z (26) (Fc)zSi(CsH )z (4) 54 diethylamino) chlorosilane. Ierroeenyldiphenylsilanol. dlferrocen ldiphenylsilane. (CHmSi(Cl)N(CH3)z -dimethyl(N,N- 2:1:1 n-Heptane FcSi(OI-I)(CH3)2 (7) [FcSl(CHa)2 :0 (2T)- I 75 dimethylamino) chlorosilane. ferrocenyldimethylsilanol. ierroeenyldlmethyl disiloxane. (CH3)2Si(C1)N(CH3)2-d1methyl(N,N- 2:1:2 do F0S1(OH)(CH3)2 (53) {FCSKCHJMIIZO (l6)- 38 dimethylarnino) chlorosilane. Icrrocenyldimethylsllanol. ferrocenyldimethyl disiloxane. (CuHmSiC1trlphenylchlorosilane 1:1:1 n-Octane. F0Sl(CsH5)a (t 62 ferroeenyltrlphenylsilane. (C 11 SiN(CHa)2-triphcnyI(N,N- 1:121 d0 FcSKCsIIm 8)- 32 dimethylamino) silane. ferrocenyldimethylsilanol. (C2Hs)2Si(Cl)N(CzII5)z--(li0l;llYl(N,N- 1:1:1 u-IIeptane FcS1(OII)(Cz II5)z (4i)- diethylemlno) chlorosilano. lerrocenyldicthylsilanol. [(CHa)2N]2SiClzbis(N,N-dimethylamino) 4:1:2 n-Octane FczSHOII); (4)- I FczSiOH (a)- :11

dichlorosilane. diferrocenylsilunedlol. triicrroccnylsilanol.

n Reflux time: hours. A half equivalent of triethylaminc was included in the reaction b Based on the silane. mixture. The product could not be isolated in its absence.

0 Products could not be isolated when mansion was used.

In preparing ferrocene derivatives containing silicon, chloride in the same solvent (100 ml). the mixture is prior art methods involved: refluxed for 20 hours and then treated with water. The a. Lithiating ferrocene, then reacting the resultant products are isolated through chromatographical lithiated ferrocene with a halosilane; means using activated alumina.

FCH mmgmmte pen-ocenylmercuric acetate Reference is hereby made to patent application, Ser. F rro enylmer uri hlorid i F L; a No. 759,493, now abandoned, of the same inventors FcsiR wh r for Germanium Derivatives Of Ferrocene," filed of Fe ferrocenyl bis(cyclopentadienyl)iron even data herewith, and assigned to the same assignee R alkyl or aryl thereof. b. Coupling iron(ll) chloride with a silylcyclopen- We claim: tadiene: I. A process for synthesizing ferrocenyltriphenylsi- (C H l$C H,,Na afg C H SiR NaC H R Lg lane comprising Fe(C H SiR adding a solution of about 0.1 mole triphenyl- The methods outlined in a. and b. above are tedious chlomsilane and 0.05 mole of triethylamine in d ti g m ip processes which about 50 ml n-octane to a mixture of ferrocene and volve the use of air-sensitive organometalic reagents. In I i hl id i about t to the Prior method abovedescl'ibedr y form a reaction mixture wherein the molar ratio of disubstituted ferrocene derivatives are formed, and not f hl r fl 101 is ;1 id hl monosubstituted derivatives. Silanols, compounds use- Silane and triethylamine solution being d d dropful for further synthesis, are not readily obtainable by wise under nitrogen e a period f about 10 i methods and f' 6o utes to said mixture of ferrocene and aluminum I It IS therefore an ob ect of this invention to provide chloride, improved methods for synthesizing silicon derivatives refluxing Said reaction mixture for about 20 hours of ferrocene, the methods employing a single step and requiring the preparation of no organometallic intermediates.

Another object of the invention is to provide methods as aforedescribed wherein silanols are readily obtainable products thereof.

treating said refluxed mixture with water to liberate products, and

isolating said liberated products to yield said ferrocenyltriphenylsilane. 

